Cargo rig



Oct. 22, 1963 Filed Dec. 6, 1960 G. W. LEHMANN CARGO RIG 4 Sheets-Sheet l I NV EN TOR. G UEHTHE? LEI/MAN WAA MKAK M AGE/Yr Oct. 22, 1963 G. w. LEHMANN CARGO RIG 4 Sheets-Sheet 2 Filed Dec. 6, 1960 INVENTOR.

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United States Patent f The present invention relates to improvements in cargo rigs, particularly for cargo rigs mounted on ships.

It has already been proposed to use a single cargo boom "servicing two hatches by shifting the boom through the transverse plane defined by two kingposts to which the topping lift gears of the boom are attached. This known boom has a fork structure at its head, which holds the hoisting gear while the boom is swung from hatch to hatch and thus avoids the necessity of dismantling the hoisting gear and then reassembling it when the boom has been positioned over the other hatch. This fork structure, however, is rather expensive and the preparations for shifting the boom from hatch to hatch are time-consuming.

It is the primary object of the present invention to produce a simpler and faster working single two-hatch boom.

It is another object to provide such an improved twohatch boom while making use of standard blocks and gears.

It is also an object of this invention to provide a novel mounting for the hoisting and topping lift gears of the boom.

It is a further object of the invention to provide an improved kingpost structure of two-hatch cargo rigs.

The above and other objects and advantages are accomplished in accordance with the invention by mounting a freely rotatable topping lift gear attaching means on the boom head, the topping lift gear means being attached to the freely rotatable attaching means on the boom head and preferably also freely rotatable attaching means on the kingposts of the cargo rig, respectively. The heel of the boom is universally mounted so that the boom may be shifted fore and aft as Well as laterally in relation to the kingposts by the topping lift gear means. A hoisting gear is preferably pivotally suspended from the boom head and a hoistinggear lead line runs over a guide block at the heel of the boom to a hoisting winch which is positioned laterally offset from the'longitudinal center plane of the rig in the plane of the kingposts. The hoisting gear is swung through a free space .between the boom and the adjacent kingpost opposite the position of the hoisting winch or on the same side thereof. In this manner, all running gears remain unchanged in their relative position to the boom, kingposts and winches while the boom is shifted from hatch to hatch.

In accordance with one embodiment of the invention, the kingposts are of tripod structure and arranged in a transverse plane on the port :and starboard side of the ship.

According to a preferred embodiment, the hoisting gear is freely swingably suspended from the boom head by means of link elements of suificient length and width to permit shifting of the boom without interference from the suspended hoisting gear.

With this cargo rig, the topping lift gears alone are used 3,107,790 Patented Qct. 22, 1963 for shifting of the boom and the hoisting gear remains idle during the shifting operations Immediately after shifting is completed, the hoisting gear is ready for operation over the other hatch and no hoisting or overhead shifting of the hoisting gear is required before shifting or lowering of the gear after shifting.

The above and other features of the invention will become more apparent in the following detailed description of certain now preferred embodiments thereof, taken in conjunction with the accompanying drawing wherein FIG. 1 is a perspective view of one embodiment of a cargo rig according to the invention;

FIG. 2 is a schematic perspectiveview of a modification of the cargo rig of FIG. 1;

FIG. 3 is a front view of another modification of a cargo rig;

FIG. 3a shows a modified detail of FIG. 3.

FIG. 4 is a schematic side'view of a group of cargo rigs arranged on a ship;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a vertical cross section showing one embodiment of the rotatable boom head of the invention;

FIG. 7 is a side view of FIG. 6';

FIGS. 8 and 9 are cross sections similar to FIG. 6 but showing two modifications of the rotatable boom head;

FIG. 10 is a front view of another modification of a cargo rig;

FIG. 10a is an enlarged view of the boom heel of the boom of FIG. 10;

FIG; 11 is a side view of one embodiment of the means for attaching the topping lift gears and the hoisting gear to the boom head;

FIG. 12 is a horizontal cross section showing a detail of FIG. 11;

FIG. 13 is a top view showing an arrangement of the topping lift winches of FIG. 10; and

FIGS. 14 and 15 are top views showing alternate arrangements of the hoisting winches of FIG. 10.

Referring now to the drawing and more particularly to FIG. 1, one embodiment of the cargo rig of the present invention is shown mounted on a barge or ship 1. The ship carries a cargo boom supporting platform or table 2 which, in the illustrated embodiment, rests on legs 5 whereby a free space is defined between the ship deck and the platform 2. Hatches 22 and 23 are arrange fore and aft of platform 2. If desired, the entire cargo rig may' be shiftable between the hatches and, for this purpose, means for moving the cargo boom supporting platform in relation to the hatches may be provided. As shown, the platform legs are mounted on tracks 6 running substantially parallel to the hatches so that the cargo rig may be moved closer to one or the other hatch.

The single cargo boom 15 has a top and a heel, the heel of the boom being universally mounted onthe platform 2 for free longitudinal and lateral pivoting movement in relation to the hatches and the transverse plane defined by the kingposts. versal mounting for the heel of the boom consists of a transverse pivot 16 mounted on a freely rotatable support.

As shown in FIG. 1, I prefer to use tripod kingposts 3, 4 the respective kingpo-sts consisting of outboard legs 3a, 3b andr4a, 4b, and inboard legs Scand 4c. Freely In the embodiment of FIG. 1, the uni-- is rotatable elements 7 and 8 are mounted at the tops of kingposts 3 and 4, respectively, topping lift blocks 7a and 8a being attached to these rotatable elements for free rotation in relation to the kingposts. The topping lifts 9 and 10 lead from the topping lift blocks 7a and 8a to the topping lift blocks 70: and 8a at the top of the boom whence lead lines 11 and 12 lead to winding drums 13 and 14 of the topping winch. The topping lift gear is attached to a rotatable top head 17 of the boom, which will be described in more detail hereinafter, together with the hoisting gear 18 suspended from elements 47, 48.

The cargo rig is illustrated in full lines in FIG. 1 in operational position above hatch 22 while its position above hatch 23 is indicated schematically and partially in broken lines in this figure.

FIG. 2 schematically shows a cargo rig identical in all respects with that of FIG. 1, except that the position Of the legs of tripod kingpos-ts 24 and 25 is reversed, i.e. the kingposts have a single outboard leg 24a and 25a, respectively, and two inboard legs 24b, 24c and 25b, 25c. Also, in this embodiment, the kingposts and the cargo boom are mounted directly on ship deck 26which serves as their supporting platform. Furthenmore, light booms 27 and 28 are pivotally mounted on the kingposts.

The advantages of using tripod king-posts instead of the conventional, conically-shaped, heavy kingposts are manifold. The latter are expensive to manufacture while tripod kingposts may be made simply by welding together standard tubular members available at a fraction of the cost. Furthermore, a split topping lift gear, which does away with special vang ropes and vang winches, requires considerable spreading of the kingpost tops to limit the forces of the topping lift gear. Therefore, kingposts for heavy cargo rigs operating with a split topping lift gear have been arranged obliquely.

With the cheaply manufactured tripod kingposts, the tops on the port and starboard side may be positioned readily as far from the longitudinal center plane of the rig as possible Without difficulty. As a matter of fact, the spreading of the tops of the kingposts almost to the full width of the ship may be readily obtained with a tripod structure, merely a small inboard-directed inclination of the outer member or members of the tripod being provided to take into consideration a possible list of the ship while moored at a pier.

Another advantage of the tripod kingposts resides in the smaller deck area required for their foundation, compared to the conventional conical kingposts. Conical 'kingposts for a heavy rig, say 150 tons capacity, require a foundation area with a diameter of about nine to ten feet at the deck level. Similar tripod kingposts would require only about three foundation areas of 30" each for the three tripod elements, leaving a free deck area for deck cargoes, particularly if one element is arranged outside and two tripot elements inboard, as in FIG. 2.

As shown in FIGS. 1 and 3, the hoisting gear 13, which comprises a block and cargo hook, is swingably suspended from the top of the boom by a pair of link elements 47, 48 which are pivoted to the top of boom 15, hoisting lead line 20 leading from the hoisting gear 13 over cheek block 20a, which is supported on the boom near the top to a guide block 19 near the heel of the boom whence it is directed to winding drum 21 of the hoisting winch. As seen in the drawing, the boom is pivotally mounted in relation to the two transversely arranged kingposts in a longitudinal plane centrally intersecting the plane of the kingposts and the hoisting winch 21 is mounted laterally offset from this center plane of the cargo rig in the plane of the kingposts.

While the guide block 19 for the hoisting lead line 20 is shown in the modification of FIG. 3 arranged at one sideyof the boom in such a manner that the boom will be shifted from hatch to hatch opposite to the side where thehoisting winch 21 is placed, FIG. 3 shows a similar guide block 19a arranged at the boom heel at the opposite side of the boom whereby the boom is shifte laterally at the same side as the position of the hoisting winch. In all other respects, the partial showing of the boom of FIG. 3a is identical with that of FIG. 3.

As is best seen in FIGS. 3 and 3a, boom 15 may be hauled from one hatch to the other through the transverse plane defined by the kingposts by so operating the topping lift gear that the hoisting gear 18 passes through the free space 31 or the free space opposite thereto between the boom and an adjacent kingpost during the shifting of the boom. For this purpose, both topping lift gears haul the boom in a plane of about elevation and about 5 elevation before the dead center point the boom is shifted laterally by hand or by an electric hydraulic device 30 acting on the pivoting means at the boom heel and turned opposite to the side on which the hoisting winch is mounted when the guide block at the heel is mounted on the upper side of the heel or turned to the side on which the winch is mounted when the guide block for the lead line is mounted at the lower side of the boom heel. During this shifting operation the boom is held by one side of the topping lift gear while the other side of the topping lift gear is slack during the shifting of the boom over the dead center angle. In this manner, the cargo boom will be raised and shifted, being pivoted about pivot means 16 out of the central plane as it passes through the transverse plane of the kingposts. V

Since the hoisting gear 18 swings freely and without obstruction from the top of the boom whcrefrom it is suspended by pivotally mounted link elements 47, v18, it will freely pass through the unobstructed space 31 defined by the boom and an adjacent kingpost. The guide block 19 near the heel of the. boom, which guides the hoisting lead line 20 to winch 21, is rotatably mounted on the boom so that it turns with the boom as the latter is shifted and thus maintains its proper guidance function for the lead line. i

As shown in FIG. 3, topping lift lead lines 11 and 12 may be guided over cheek blocks '33 and 32 to the winding drums 13 and 14. The boom supporting platform 2 is preferably braced by vertical supports or columns 34, 35, 36 and the latter may be so spaced as not to interfere with cargo containers 37 carried on the deck.

As the side and top views, respectively, of FIGS. 4 and 5 schematically indicate, the cargo rigs may be ar-. ranged in groups, two booms 15, 15b, for example, serving four hatches 38, 39, 40 and 41.

The rotatable boom head 17 will now be more fully described in connection with FIGS. 6 and 7. In the embodiment herein shown, the hollow head of boom 15 carries an annular support having a generally frusto-conical bearing face 46a supporting a correspondingly frustoconical portion of a center piece 42 for free rotation. The center piece is mounted on anti-friction bearing means, roller bearings 43'and 44 serving to balance .the moment and roller bearing 45 serving to transfer the axial forces. The freely rotatable center piece has eyes 49 and 50 for attachment of the topping lift gears.

Bolts 46 are mounted at the head of the boom to serve V as pivotal attachment means for the links 47, 48 upon which the hoisting gear 18 is suspended for free swinging movement in relation to the boom. For this purpose, the spacing 51 of the links is sufficient to provide clearance for the boom when the same is shifted.

A modified embodiment of the rotatable boom head is illustrated in FIG. 8. block 46b is fixedly mounted in the hollow head of boom 15, a support bolt 46' for the hoisting gear suspension links passing through the boom and the support block. The support block has a cylindrical bearing surface 46b supporting a correspondingly cylindrical portion of a rotatable cap 52 for free rotation. Roller bearings 43', 44' and 45 are similarin structure and function to the like antifriction bearing means in FIG. 6. The topping lift gears V In this modification, a bearing may extend laterally, as shown at 54 in full lines, or upwardly, as shown at 53 in broken lines.

Still another modification of the rotatable boom head is illustrated in FIG. 9. Here the eyes 55, 56 for attachment of topping lift gears 9 and are independently mounted on a rotatable member comprising eyebolt support plates 57 and 58. The member is mounted for free rotation in bearing sleeve 46c, friction bearings being provided similarly to the embodiments of FIGS. 6 and 8, as shown. A transverse belt 46" again provides pivotal support for the hoisting gear suspension links.

It will be obvious that all three illustrated embodiments of the rotatable boom head provides freely rotatable means for attachment of the topping lift gears. Also, in all three embodiments, means is provided for suspending the hoisting gear for free swinging movement from the boom head.

The cargo n'g shown in FIG. 10 differs somewhat from that of FIGS. 1 and 3 but to simplify the understanding and description thereof, like parts thereof have been designated by identical reference numerals. In this embodiment, the single two-hatch boom of the present invention has been combined with conventional kingposts, the only requirement being that the spacing between the boom and at least the upper portions of the kingposts are sufficient to permit free passage of the hoisting gear as the boom is shifted from hatch to hatch.

In the illustrated embodiment, the kingposts are generally comically upwardly tapering uprights 3 and 4' which are outwardly inclined from the center plane of the rig wherein the boom is pivotally mounted.

The hoisting lead line is guided from the hoisting gear 13 over cheek block 59 mounted inside hollow boom 15', downwardly through the hollow boom over centrally aligned guide block 6i) to hoisting winch 62. In the case of heavy rigs, two hoisting lead lines are provided and are then led to two winches 62 and 62a. As shown in FIGS. 14 and 15, respectively, the axes of the hoisting winch or winches may either extend transversely, i.e. parallel to the plane defined by the kingposts, or longitudinally, i.e. parallel to the center plane of the rig which is perpendicular to the plane defined by the kingposts.

As most clearly shown in the enlarged illustration of FIG. 10a, the guide block 60 is mounted on disc 60a which constitutes a freely pivotal or rotatable mounting means for the boom so that the guide block 60 turns with the boom. Disc so is mounted for free rotation in a bearing ring 61M which is fixedly carried by the deck or platform supporting the boom. The hoisting winch or winches are generally vertically below the guide block 60 and the disc 61in has a central passageway permitting the lead line 20 to be guided :therethrough to the winch or winches.

The heel of boom 15' is forked, legs 61 of the boom heel being rigidly secured to the rotatable discs 60a on brackets 61a which constitute a pivotal mounting for the boom whereby the boom may be shifted from one hatch to the other about its pivotal mounting, while the disc is simultaneously freely rotated. Thus, the rotatable disc 60a and the pivotal mounting 61a constitute a universal mounting for the heel of the boom, functionally similar to the embodiment of FIG. 1.

Since the guide block 60' is centered in the space defined by the forked heel of the boom, the lead line 20 will always remain properly guided, regardless of the elevation and outreach of the boom. I

The hoisting and topping lift gears are generally like those of the embodiments of FIGS. 1 and 3, Wherefor they will be no further described, except in respect of structural differences noted hereinbelow.

The topping lift lead lines 11 and 12 are guided over top cheek blocks 32 and 33 as well as lower cheek blocks 65 and 66 to the topping lift winches 67 and 68 within the deck house 69, which supports the boom, special supports 81 for rotatable disc 600 being shown at 81. The

6 l relative positions of the topping lift winches are shown in the top view of FIG. 13 which shows the hoisting lead line 20 to pass centrally between the topping lead lines 11 and 12 so that there is no interference between these lines.

A preferred means for attaching the topping lift gears and the hoisting gear to the head of the boom is illustrated in FIGS. 11 and 12, the rotatable boom head used for purposes of illustration being the rotatable cap 52 with its eyes 54, as shown and described'more fully in connection with FIG. 8.

In the illustrated modification herein shown, thehoisting gear 18 is eccentrioally mounted on the boom, which produces a considerable counter-moment enabling the boom to be constructed with about 20% lighter weight than would otherwise be required for the same hoisting capacity. The eccentric attachment of the hoisting gear links 47, 48 to the boom head produces a moment counteracting the moment set up by the topping lift gear on the boom. For this purpose, the boomhead is pro vided with a collar 66 carrying a bolt 64 which provides a pivotal mounting for the links 47, 48 in a manner similar to bolt 46 described hereinabove in connection with other figures of the accompanying drawing.

Whether the hoisting gear suspension links are eccenn'ically mounted on the boom head or not, the two links are connected by an arcuate cross-piece 70 which carries an anti friction roller supported band 71. The

topping lift blocks 7a and 8a are attached to the eyes 54 of the rotatable boom head by means of pairs of links 72, 73. Those topping lift gear suspension links which are adjacent the hoisting gear are inter-connected by an arcnate shield member 74 (see particularly FIG.

12). Spacing members 70 and 74 provide adequate clearbeing mounted on the kingposts for their topping lift' gears in a manner similar to that shown in FIG. 2 in connection with tripod kingposts.

As will be obvious, the hoisting and/or the topping lift winches may be placed at any desired location, for instance below deckin a protected space, the topping lift lead'lines lbeing guided through the open space 'defined by the legs of the tripod kingposts or through the center of the tubular members forming these legs or the 'kingposts themselves, as in FIG. 10. In the same manner, the hoisting lead lines may lead through the center of the tubular member forming the boom.

While the invention has been described and illustrated in connection with certain preferred embodiments, it

will be understood that many variations and modifications may occur to the skilled in the art, particularly I after benefiting from the present teaching, without departing from the spirit and scope of this invention as defined in the appended claims.

What is claimed is: p

1. A cargo rig comprising two kingposts; 'a boom between said kingposts, said boom having a heel and a head; a universal mounting means for the boom heel whereby said boom may be shifted fore and aft as well as laterally in relation to said kingposts; topping lift gear means for shifting said boom; a freely rotatable topping lift gear attaching means mounted on the boom head, the'itopping lift gear means being attached to the said attaching means and to the kingposts, respectively; a hoisting gear; means for pivotally suspending the hoisting gear, from the boom head; a leadline for said hoisting gear; a hoisting winch for said lead line; and'guide block means mounted, respectively, near the head and the heel of the boom for rotation with the boom, the guide block means guiding the lead line from the hoisting gear along the lentgh of the boom to the winch.

2. The cargo ring of claim 1, wherein said kingposts are of tripod structure.

3. The cargo ring of claim 1, wherein said kingposts are conically upwardly tapering uprights outwardly in- .clined from said boom.

4. The cargo rig of claim 1, further comprising freely rotatable topping lift gear attaching means mounted on the kingposts, the topping lift gear means being attached to said attachingmeans.

5. The cargo rig of claim 1, wherein the pivotal suspending means comprises a pair of links having a clearance therebehyeen at least equal to the diameter of the boom head. 7

6. A cargo rig for a ship having a deck comprising a supporting platform for the rig; a plurality of upright supports mounting the platform on the deck whereby free cargo space is defined between the deck and the platform; two kingposts mounted on the platform; a boom mounted on the platform between said kingposts, said boom having a heel and a head; a universal mounting means for the boom heel whereby said boom may be ,shifted fore and aft as well as laterally in relation to said kingposts; topping lift gear means for shifting said boom;

a freely rotatable topping lift gear attaching means mounted on the boom head, the topping lift gear means being attached to the said attaching means and to the kingposts, respectively; a hoisting gear; means for pivotal-1y suspending the hoisting gear from the boom head; .a lead line for said hoisting gear; a hoisting winch for said lead line; and guide block means mounted, respectively, near the head and the heel of the boom for rotation with the boom, the guide block means guiding the lead line from the hoisting gear along the length of the boom to the winch.

7. The cargo rig of claim 6, further comprising means for moving said platform.

8. A cargo rig comprising two kingposts; a hollow :boom between said kingposts, said boom having a heel and a head; a universal mounting means for the boom heel whereby said boom may be shifted fore and aft as well as laterally in relation to said kingposts, said universal mounting means including a freely rotatably mounted boom support and means for pivotally mounting the boom heel on the support; topping lift gear means for shifting said boom; a freely rotatable topping lift gear attaching means mounted on the boom head, the topping lift gear means being attached to the said attaching means and to the kingposts, respectively; a hoisting gear means for pivotally suspending the hoisting gear from the boom head; a lead line for said hoisting gear; a hoisting winch for said lead line; and guide block means mounted, respectively, near the head and the heel of the boom for rotation with the boom, the guide block means guiding the lead line from the hoisting gear along the length of the boom to the winch.

9. The cargo rig of claim 8, wherein the boom heel is a forked structure having two legs defining a free space therebetween, said two legs being pivotally mounted on the support and one of said guide block means for the hoisting gear lead line being fixedly mounted in said free space on the support, the lead line passing through the hollow boom to said latter guide block means and then through a passageway in said boom support, and the hoisting winch being positioned below said support to receive the hoisting lead line from the guide block.

10. A cargo rig comprising two kingposts; a boom between said kingposts, said boom having a heel and a head; a universal mounting means for the boom heel whereby said boom may be shifted fore and aft as well as laterally relation to said kingposts, two topping lift gears for shifting said boom; freely rotatable topping lift gear attaching means mounted, respectively, on the boom head and on the two kingposts; means for attaching each topping lift gear to the freely rotatable topping lift gear attadlnng means on the boom head and to a respective one of the freely rotatable topping lift gear attaching means on the two kingposts; topping lift lead lines attached to each of said topping lift gears; a topping lift winch means for each of said lead lines; a guide block guiding each of said topping iift lead lines to said topping lift winches; a hoisting gear pivotally suspended from the boom head; a lead line for said hoisting gear; a hoisting winch for said lead line, and guide block means mounted, respectively, near the head and the heel of the boom for rotation with the boom, the guide block means guiding the lead line from the hoisting gear along the length of the boom to the winch.

11. The cargo rig of claim 10, wherein the guide blocks for said topping lift lead lines are mounted atop a respective one of said freely rotatable topping lift gear attaching means on the two kingposts.

12. The cargo rig of claim 10, further comprising means mounting the winches in a protected space and additional guide blocks for the topping lift lead lines for guiding said lines to the protected topping lift Winches.

13. A cargo rig comprising two ldngposts; a boom between said kingposts, said boom having a heel and a head; a universal mounting means for the boom heel whereby said boom may be shifted fore and aft as well as laterally in relation to said kingposts; two topping lift gears for shifting said boom; each topping lift gear including a pair of topping lift blocks, one of the blocks of each pair being attached to a respective one of said kingposts; a freely rotatable member mounted on the boom head; means for attaching the other block of each pair to said rotatable member; a hoisting gear suspended from the boom head; a pivot mounted on the boom head; link means having a clearance therebetween at least equal to the boom head diameter and attached to the pivot and carrying the hoisting gear; an

for providing substantially friction-less contact between I said spacer members. 1

15. A cargo rig comprising two kingposts; aboom between said kingposts, said boom having a heel and a head; a universal mounting means for the boom heel whereby said boom may be shifted fore and aft as well as laterally in relation to said kingposts; two topping lift gears for shifting said boom; freely rotatable topping lift gear attaching means mounted, respectively, on the boom head and on the two kingposts; means for attaching each lift gear to the freely rotatable topping lift gear attaching means on the boom head and to a respective one of the freely rotatable topping lift gear attaching means on the two kingposts; topping lift lead lines attached to each of said topping lift gears; a topping lift winch means for each of said lead lines; a. guide block guiding each of said topping lift lead lines to said topping lift winches; a hoisting gear; means for pivotally suspending the hoisting gear from the boom head; pivot means fixedly and eccentrically mounted on said boom between the longitudinal axis of the boom and the hoisting gear for mounting the suspending means on the boom; a lead line for said hoisting gear; a hoisting winch for said lead line; and guide block means mounted, respectively, near the head and the heel of the boom for rotation with the boom, the guide block means guiding the lead line from the hoisting gear along the length of the boom to the hoistinglwinch. L a

9 Ii) 16. The cargo rig of claim 15, wherein the hoisting 2,914,193 Kohnenkamp et a1 Nov. 24, 1959 winch is positioned laterally offset from the longitudinal center plane of the rig. FOREIGN PATENTS 17. The cargo rig of claim 15, wherein the hoisting 937 Germany J m 19, 5 Wins-h is positioned below the universal mounting means 5 1 020 544 Germany Dec, 5 57 of the boom heel. O REFER S References Cited in the file of this patent ENCE U D TA A Motorfrachtschlfi Lichtenfels, finom Schiff and Hafen, NITE S TES P TENTS November 1954, CD. Heydorns, Uetersen, near Ham 2,613,001 Green Oct. 7, 1952 10 burg. 

1. A CARGO RIG COMPRISING TWO KINGPOSTS; A BOOM BETWEEN SAID KINGPOSTS, SAID BOOM HAVING A HEEL AND A HEAD; A UNIVERSAL MOUNTING MEANS FOR THE BOOM HEEL WHEREBY SAID BOOM MAY BE SHIFTED FORE AND AFT AS WELL AS LATERALLY IN RELATION TO SAID KINGPOSTS; TOPPING LIFT GEAR MEANS FOR SHIFTING SAID BOOM; A FREELY ROTATABLE TOPPING LIFT GEAR ATTACHING MEANS MOUNTED ON THE BOOM HEAD, THE TOPPING LIFT GEAR MEANS BEING ATTACHED TO THE SAID ATTACHING MEANS AND TO THE KINGPOSTS, RESPECTIVELY; A HOISTING GEAR; MEANS FOR PIVOTALLY SUSPENDING THE HOISTING GEAR FROM THE BOOM HEAD; A LEAD LINE FOR SAID HOISTING GEAR; A HOISTING WINCH FOR SAID LEAD LINE; AND GUIDE BLOCK MEANS MOUNTED, RESPECTIVELY, NEAR THE HEAD AND THE HEEL OF THE BOOM FOR ROTATION WITH THE BOOM, THE GUIDE BLOCK MEANS GUIDING THE LEAD LINE FROM THE HOISTING GEAR ALONG THE LENGTH OF THE BOOM TO THE WINCH. 